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Flexible device and its preparation method
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A technology of flexible devices and anode active materials, applied in the field of flexible devices and their preparation, can solve problems such as great difficulty, decreased bonding strength, and easy fatigue, so as to improve interface problems, increase bonding strength, and increase contact area Effect
Active Publication Date: 2017-06-09
GUANGDONG ZHUGUANG NEW ENERGY TECH
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Problems solved by technology
However, when the flexible battery pack of this design is bent, due to the strong rigidity of the top layer and the bottom layer, the bending degree and fatigue strength of the flexible battery pack are greatly limited due to the influence of stress, which affects the performance of the flexible battery pack. After a certain bending angle and bending times, the bonding strength of the adhesive will decrease, resulting in poor reliability, and fatigue will easily occur in the non-bonding area close to the adhesive due to the inconsistent force, which is harmful to flexibility. The safety performance of the battery pack is at risk
Moreover, this method needs to control the bonding strength of the adhesive and the uniformity of the amount used in each area, and it is very difficult to mass produce
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Embodiment 1
[0034] Preparation of porous current collector: select copper foil with a thickness of 100 μm as the positive electrode current collector, and then use laser drilling to sinter the current collector to obtain a circular hole shape, a hole diameter of 2 μm, and a hole spacing (two holes at most The distance between the adjacent edges) is 1 μm and the hole depth is 99 μm, so as to obtain a porous current collector for use;
[0035] Negative sheet preparation: use silicon-carbon composite (30% silicon content) as the negative electrode active material, PVDF as the binder, Supper-P as the conductive agent (the mass ratio of the three is 94:3:3), and NMP as the solvent configuration Slurry; then coated on the surface of the above-mentioned porous current collector containing the pore structure (control the coating thickness during coating so that W1 / (W1+W2)=50%), dry, cold press, cut into single The sheet (with an empty foil area around it and a coated area in the middle) is ready ...
Embodiment 2
[0038] The difference from Example 1 is that it includes the following steps:
[0039] Preparation of the porous current collector: the pore depth of the porous current collector is 90 μm.
[0040] The rest are the same as in Embodiment 1 and will not be repeated here.
Embodiment 3
[0042] The difference from Example 1 is that it includes the following steps:
[0043] Preparation of porous current collector: select copper foil with a thickness of 100 μm as the negative electrode current collector, and then use laser drilling to sinter the current collector to obtain a circular hole shape, a hole diameter of 1 μm, and a hole spacing (two holes at the maximum The distance between the adjacent edges) is 4.17 μm and the hole depth is 85 μm, so as to obtain a porous current collector for use;
[0044] Negative sheet preparation: use silicon-carbon composite (30% silicon content) as the negative electrode active material, PVDF as the binder, Supper-P as the conductive agent (the mass ratio of the three is 94:3:3), and NMP as the solvent configuration Slurry; then coated on the surface of the above-mentioned porous current collector containing the pore structure (control the coating thickness during coating so that W1 / (W1+W2)=10%), dry, cold press, cut into sing...
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Abstract
The invention belongs to the technical field of flexible devices, and in particular relates to a flexible device comprising a positive electrode sheet, a negative electrode sheet and a separator, the negative electrode sheet is composed of a negative electrode active material and a negative electrode current collector, and the negative electrode current collector is divided into A surface and B surface; the negative electrode current collector has a porous structure, including a porous structure area and a non-porous area, and the volumes of the porous structure area and the non-porous area are respectively V1, V2, and V1 / (V1+V2)≥ 10%; the pores in the pore structure region communicate with the A surface or the B surface of the negative electrode current collector. The present invention adopts a porous current collector, so that the negative electrode active material is completely or partially embedded in the pore structure of the porous current collector, thereby increasing the adhesion between the current collector and the active material, and ensuring that the interface of the flexible device is tightly bonded during the bending process; Therefore, the prepared flexible devices have more excellent flexibility and electrochemical performance.
Description
technical field [0001] The invention belongs to the technical field of flexible devices, in particular to a flexible device and a preparation method thereof. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes in the field of lithium-ion batteries; And a lot of use on other portable electrical appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and electric storage for storage power station. [0003] However, with the development of electronic devices towards personalization, a large number of creative electronic products have emerged rapidly: wearable devices such as smart watches, smart ...
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Application Information
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